#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

int NumberOf1(int n)
{
	int i = 0;
	int count = 0;
	while (n)
	{
		n = n & (n - 1);
		count++;
	}
	return count;
}

int main()
{
	int n = 0;
	scanf("%d", &n);
	int ret = NumberOf1(n);
	printf("%d\n", ret);
	return 0;
}